I have had these for the past 6 months or so and put about 6,000-7,000 miles on them. What I can say is that going from stock to these you definitely feel a difference in terms of ride quality. At first when people said coil overs where bouncy, I thought they where only bouncy on dips or bumps. It is actually bouncy ALL the time, so keep that in mind. Over time you get use to it so it is not a big deal, I kind of like it, but keep in mind that I am in perfect physical health and not a complainer. So if you have back problems or anything I would not really recommend them. You also feel the ground more, every little crack, pebble, whatever, you feel it. Another thing to note is that they do not take impact very well. The shocks just don't handle bumps at all. The result is if you are planning on going really low you're going to hit your axle on your frame a lot and notching your frame would be a good idea.
If you want to use these for autocross or track days, wouldn't get them. If you just want to mildly lower your car, lets say nothing more than 2" I wouldn't get these. If you want to slam the sh*t out of your car on a budget, then get these.
So saying all that determine which one you want. If you want a really comfortable ride, or use this for tracking, etc. I would save up and get something better.